锥阀流场的数值模拟及结构优化
发布时间：2018-07-25 17:12
【摘要】：锥阀具有密封性能好、过流能力强、响应快、抗污染能力强等特点,在流体输送中得到了广泛的应用。本文在调研了大量国内外有关文献资料的基础上,针对锥阀存在的能量损失大、能量利用率低、噪音大等问题进行了数值计算与研究。 本文运用PHOENICS流体计算软件,建立了与实际所用锥阀相同的物理结构和参数的计算几何模型,采用了结构化正交局部加密网格,应用了k -ε湍流计算模型,分别对外流式和内流式锥阀内部流场进行了数值模拟计算,研究了流量变化、开启度变化对锥阀流场特性的影响,并利用Sci、Origin等后处理软件对模拟结果的数据、图片做了处理,得到了锥阀内部流场的速度和压力分布情况,并对模拟结果进行了分析,得到能量损失、噪音与流道结构之间的关系。在此基础上,对锥阀的流场结构进行优化,提出了流道优化设计方案,并进行CFD解析,验证了其优化方案的可行性,同时,在其它条件不变的情况下,研究了流量、开启度与流量系数之间的关系,给出了不同流量下和不同开启度下的流量系数变化规律。 本文的研究结果,对于分析锥阀的性能、进行流道的结构优化和实际工程应用都具有一定的指导作用。
[Abstract]:Cone valve has been widely used in fluid transportation because of its good sealing performance, strong overcurrent capacity, fast response and strong anti-pollution ability. Based on a large number of literatures at home and abroad, this paper has carried out numerical calculation and research on the problems of large energy loss, low energy utilization ratio and large noise in conical valves. In this paper, the computational geometry model of the same physical structure and parameters as the practical cone valve is established by using the PHOENICS fluid calculation software. The structured orthogonal locally encrypted grid is used, and the k-蔚 turbulence calculation model is applied. The internal flow field of external flow valve and internal flow cone valve were numerically simulated, and the effects of flow rate change and opening change on the flow field characteristics of cone valve were studied. The data of simulation results were processed by using SciCon Origin and other post-processing software. The velocity and pressure distribution of the flow field in the cone valve is obtained, and the simulation results are analyzed, and the relationship between energy loss, noise and the flow channel structure is obtained. On this basis, the flow field structure of the conical valve is optimized, the flow channel optimization design scheme is put forward, and the CFD analysis is carried out to verify the feasibility of the optimization scheme. At the same time, the flow rate is studied under the condition that other conditions remain unchanged. The relationship between the opening degree and the flow coefficient, and the variation law of the flow coefficient under the different flow rate and the different opening degree are given. The results of this paper can be used to analyze the performance of conical valve, optimize the structure of flow channel and practical engineering application.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH134
[Abstract]:Cone valve has been widely used in fluid transportation because of its good sealing performance, strong overcurrent capacity, fast response and strong anti-pollution ability. Based on a large number of literatures at home and abroad, this paper has carried out numerical calculation and research on the problems of large energy loss, low energy utilization ratio and large noise in conical valves. In this paper, the computational geometry model of the same physical structure and parameters as the practical cone valve is established by using the PHOENICS fluid calculation software. The structured orthogonal locally encrypted grid is used, and the k-蔚 turbulence calculation model is applied. The internal flow field of external flow valve and internal flow cone valve were numerically simulated, and the effects of flow rate change and opening change on the flow field characteristics of cone valve were studied. The data of simulation results were processed by using SciCon Origin and other post-processing software. The velocity and pressure distribution of the flow field in the cone valve is obtained, and the simulation results are analyzed, and the relationship between energy loss, noise and the flow channel structure is obtained. On this basis, the flow field structure of the conical valve is optimized, the flow channel optimization design scheme is put forward, and the CFD analysis is carried out to verify the feasibility of the optimization scheme. At the same time, the flow rate is studied under the condition that other conditions remain unchanged. The relationship between the opening degree and the flow coefficient, and the variation law of the flow coefficient under the different flow rate and the different opening degree are given. The results of this paper can be used to analyze the performance of conical valve, optimize the structure of flow channel and practical engineering application.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH134
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